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송재석,최병수,원종욱,노재훈 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.4
목적 : 소음 특수건강진단시 문진표의 유용성을 알기 위하여 실시되었다. 방법 : 자료로는 전국을 5대 권역으로 나눈 후 연구에 협조적인 산업보건기관을 대상으로 하여, 소음성 난청이 발생한 사업장과 그 부서에 대하여 정상인 근로자의 검진기록과 작업환경측정 기록 및 문진표를 수집하여 분석하였다. 결 과 : 각각의 문진 항목과 청력이상 여부에 대한 분석결과, 귀에서 소리가 난다고 하는 항목과 최근 작은 소리가 잘 안들린다고 하는 만성 특이적 항목만 청력이상 여부와 관계가 있었고, 급성 항목들은 청력 이상 여부와 통계적 연관성이 없었다. 또한 7개의 설문 항목과 연령 및 근무경력만을 이용하여 청력이상을 판정한다고 하였을 때, 실제 건강진단 결과와 비교하게 되면 민감도, 59 %, 특이도, 88 %로 계산 되었으며, 평균 23 %정도가 잘못 분류되었다. 결 론 : 만성적이고 특이적인 항목을 위주로 한 단순하고도 판별력있는 항목의 개발이 필요하며, 이러한 항목들을 전산화하였을 때, 효과적인 소음성 난청의 선별검사 체계를 구축할 수 있을 것이다. Objectives : This study was performed to investigate the effectiveness of the questionnaire. Methods : Workers'health examination records, work environment record, and questionnaires of selected industries as samples were analysed using logistic regression analysis and discrimination analysis Results'Cases of bearing impairment (Dl+C) as dependent variables, and age, work duration and level of environmental noise as independent variables were selected for multiple unconditional logistic regression analysis. Odds ratio was 4.04 in hearing difficulty, 2.78 in tlnnitus and 1.08 in age. In the second analysis Noise induced hearing loss is selected as dependent variable. The OR in hearing difficulty was 3.67(95 % C.1. : 1.61 8.61), and was 1.09(95 % C.1. : 1.05-1.14) in age. Conditionnal multlple logistic regression analysis was performed. In hearing impairment as dependent variable, the OR of age was 1.02(95 % C.1. : 1.00-1.04) and other variables were not significant. However, NIHL as dependent, the OR of hearing difficulty was 4.57(95 % C.1. : 1.43-14.67). According to multiple logistic regression adopting each items of questionnaire as dependent variable, the only item of hearing difficulty showed significant difference with hearing ability. The discrimination analysis was performed with the class variable of hearing impairment, and discrimination variables of age, work duration, and environment noise level. The sensitivity of 59 %, and specificity of 88 %, and average error count of 23 % were obtained. When the numbers of items answered in questionnaire were assumed as the parameter of judgement for noise induced hearing loss (NIHL), the highest sensitivity and specificity were 33.5% and 49.0% in cases of more than two items answered. Conclusions : The development of items that is simple and discriminative mainly consisted of chronic and specific diseases related items is needed. Computerization for newly developed items might be needed to establish effective surveillance system for NIHL in the future.
Factors influencing deflaking kinetics in repulping to produce molded pulp
Byoung-Uk Choi,Jeong-Yong Ryu,Bong-Keun Song 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.1
Process variables affecting the deflaking or defibering kinetics of recovered papers in repulping to produce molded pulp were investigated with laboratory low and high consistency pulpers and a pilot high consistency pulper. The defibering kinetics at various repulping conditions were compared in terms of the deflaking rate coefficient, which can be easily obtained by measuring flake contents as a function of slushing time and then by performing a non-linear regression analysis on the data. The two main variables affecting defibering rate are found to be the repulping concentration and the rotational speed of rotor, which have to be chosen as manipulated variables to optimize a repulping process. Increasing repulping concentration and rotor speed generally promotes the defibering of recovered paper.
( Sang Bun Choi ),( Youn Jae Lee ),( Jae Ik Lee ),( Young Jin Song ),( Byoung Jin Choi ),( Jong Han Kim ),( Eun Uk Jung ),( Sung Jae Park ),( Sang Heon Lee ),( Ji Hyun Kim ),( Jung Sik Choi ),( Sam Ry 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3
Background/Aims: The reappearance rates of hepatitis C virus (HCV) RNA after a sustained virological response (SVR) have been reported to be 1-2%. We investigated the reappearance rate of HCV RNA after SVR in chronic hepatitis C (CHC) patients treated with pegylated interferon (PEG-IFN) and ribavirin. Methods: In total, 292 CHC patients who achieved an SVR after PEG-IFN and ribavirin treatment were included. They were treated with subcutaneous injections of either PEG-IFN-α 2a or 2b plus ribavirin orally. Liver function tests and qualitative HCV RNA assays were performed every 6 months during the follow-up period after an SVR. Results: Among the 292 patients, 224 (genotype 1, 92; genotype non-1, 132) were followed up for more than 6 months after SVR. These 224 patients were aged 48.1±11.5 years (mean±SD), and 129 of them were male. The median follow-up duration was 18 months (range 6-60 months). The reappearance rate of HCV RNA during follow-up was 0%. Two patients who achieved an SVR developed hepatocellular carcinoma during the follow-up period. Conclusions: An SVR was maintained in all CHC patients treated with PEG-IFN plus ribavirin during a median follow-up of 18 months. However, a screening test for hepatocellular carcinoma is needed for patients with an SVR. (Korean J Hepatol 2011;17:183-188)